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1 dashley 15 /* $Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/lib_c++_c_asm_non_uc/src_os_unix_win/c___app_common/md5/md5.h,v 1.5 2007/01/27 03:34:17 dashley Exp $
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3     //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
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7     // Version 3, 29 June 2007
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681     ** --------------------------------------------------------------------------------
682     ** MD5 Message Digest C Calculation Module Header File
683     ** Copyright (C)2007 David T. Ashley
684     **
685     ** This program is free software; you can redistribute it and/or
686     ** modify it under the terms of the GNU General Public License
687     ** as published by the Free Software Foundation; either version 2
688     ** of the License, or (at your option) any later version.
689     **
690     ** This program is distributed in the hope that it will be useful,
691     ** but WITHOUT ANY WARRANTY; without even the implied warranty of
693     ** GNU General Public License for more details.
694     **
695     ** You should have received a copy of the GNU General Public License
696     ** along with this program; if not, write to the Free Software
697     ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
698     ** 02110-1301, USA.
699     ** --------------------------------------------------------------------------------
700     ** This is an implementation of the MD5 message digest algorithm. Please
701     ** see RFC 1321 for all details of the algorithm. This is a fully original
702     ** implementation done directly from the RFC, so it is free of all licensing
703     ** issues. Note that this module is under the GNU GPL, so it may be used
704     ** more-or-less freely.
705     **
706     ** Note that although R. Rivest's documentation and algorithm allow for something
707     ** whose MD5 is formed to not consist of an integral number of bytes,
708     ** this software module does not allow for this. Anything put through
709     ** the implementation in this software module must be an integral number
710     ** of bytes.
711     **
712     ** The fundamental paradigm of this module is that one opens (or initializes
713     ** the MD5 data structure, then puts data through it, then closes the data
714     ** structure and extracts the MD5. Note that multiple extracts are not
715     ** allowed--the close operation is final and data may not be added after
716     ** the close.
717     **
718     ** No dynamic memory is allocated by this module.
719     **
720     ** This module was speed tested against "md5sum -b" that comes with CygWin.
721     ** For a file approximately 550M, CygWin took 48 seconds but the widget
722     ** using this module took 41. So, they are in the same speed ballpark
723     ** but there are probably still speed optimizations possible. However,
724     ** there is no intent to spend a lot of effort to get an extra 20% out of
725     ** this module.
726     */
728     #ifndef MD5_H_INCLUDED
729     #define MD5_H_INCLUDED
731     #ifdef MODULE_MD5
732     #define DECMOD_MD5
733     #else
734     #define DECMOD_MD5 extern
735     #endif
737     //Fundamental state (or RFC 1321 calls it context) for forming
738     //MD5s. Conceptually private to this module.
739     struct MD5_Md5StateStruct
740     {
741     unsigned A, B, C, D;
742     //Directly from RFC 1321.
743     unsigned long long int bit_count; //64 bits on GCC x86
744     //The count of bits processed thus far. The algorithm here
745     //works in bytes, not bits, so this is advanced by 8 on
746     //each byte processed.
747     unsigned X[16];
748     //These are the words corresponding to the chars. We don't
749     //dare union them because of big-endian/little-endian concerns.
750     //The name "X" comes directly from RFC 1321 nomenclature.
751     unsigned char buf[64];
752     //We can't proceed to execute a round unless we have the
753     //full 512 bits = 16 words = 64 bytes of data. We must
754     //buffer it because we can't count on being called with data
755     //blocks that are a multiple of 64. We may have data hanging
756     //around between calls. We fill up this buffer from the low
757     //end, i.e. [0], then [1], then [2], etc.
758     };
760     //Result structure, used to hold result. Caller is allowed to
761     //pick it apart.
762     struct MD5_Md5ResultStruct
763     {
764     unsigned md5_words[4];
765     char md5_chars[33];
766     //Zero terminated string containing MD5 formed.
767     };
769     //Initializes the MD5 calculation structure.
770     DECMOD_MD5
771     void MD5_Md5StateStructOpen(struct MD5_Md5StateStruct *arg);
773     //Adds data to it. Zero length is OK.
774     DECMOD_MD5
775     void MD5_Md5StateStructAddData(struct MD5_Md5StateStruct *arg,
776     void *data,
777     size_t len);
779     //Closes the structure and returns the MD5. This is destructive--one cannot
780     //continue adding characters. All characters returned are lower-case.
781     DECMOD_MD5
782     void MD5_Md5StateStructClose(struct MD5_Md5StateStruct *state,
783     struct MD5_Md5ResultStruct *result);
785     //Returns version control information.
786     DECMOD_MD5 const char *MD5_cvcinfo(void);
787     DECMOD_MD5 const char *MD5_hvcinfo(void);
789     //Definition of the version of the H file, used for providing version control
790     //information to external callers.
791     #define MD5_H_VERSION ("$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/lib_c++_c_asm_non_uc/src_os_unix_win/c___app_common/md5/md5.h,v 1.5 2007/01/27 03:34:17 dashley Exp $")
793     #endif
795     //**************************************************************************
796     // $Log: md5.h,v $
797     // Revision 1.5 2007/01/27 03:34:17 dashley
798     // a)Block data operation changed to take length argument of type size_t.
799     // b)Unit-testing has been completed.
800     //
801     // Revision 1.4 2007/01/27 01:40:51 dashley
802     // GPL license statements added and enhanced.
803     //
804     // Revision 1.3 2007/01/27 01:37:10 dashley
805     // GPL license statement added.
806     //
807     // Revision 1.2 2007/01/13 06:16:27 dashley
808     // Edits for compilation under Linux.
809     //
810     // Revision 1.1 2007/01/13 04:45:42 dashley
811     // Initial checkin.
812     //**************************************************************************
813     // End of $RCSfile: md5.h,v $.

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